Question

How does the atomic size vary in Modern Periodic Table? give reasons..

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Answer 1

Here's the Answer :

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In Modern Periodic table the atomic size of element varies from left to right .

• The size of elements decreases from when we move left to right in a period . The elements of left have a greater atomic radius than that of right sided elements .

It is because , when we move from left to right , the number of electrons and protons increases . The attraction force of the protons are more than electrons . Since , it increases when we move right so the force also increases in right . As a result the force of protons the radius of atom get reduced and size of elements decreases .

• Again , in a group when we move downward the atomic size increases .

It is because the atomic shell increases down the group . When. we are at 1st Group there is only one shell . In 2nd group two shells . In this way it increases and the radius of atom also increases .

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Answer 2

Answer:

Explanation:

1.atomic size INCREASES down the period .

reason:after each period,a shell gets added up which increases its atomic size.

2.Atomic size DECREASES from left to right.

reason:a steady increase in the  nuclear force pulls the electrons closer to the nucleus,thereby decreasing the atomic size